derek.holloway
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60 lines
2.3 KiB
LLVM
60 lines
2.3 KiB
LLVM
; RUN: opt -S -passes=spirv-prepare-functions -mtriple=spirv64-unknown-unknown < %s | FileCheck %s
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; @llvm.bswap.* is replaced with a call to a SPIR-V helper function whose
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; body implements the byte-swap with shifts/masks/ors.
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define i32 @bswap_i32(i32 %x) {
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; CHECK-LABEL: define i32 @bswap_i32(
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; CHECK: call i32 @spirv.llvm_bswap_i32(i32 %x)
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%r = call i32 @llvm.bswap.i32(i32 %x)
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ret i32 %r
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}
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; @llvm.fshl is wrapped in a generated SPIR-V helper function.
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define i32 @fshl_i32(i32 %a, i32 %b, i32 %c) {
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; CHECK-LABEL: define i32 @fshl_i32(
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; CHECK: call i32 @spirv.llvm_fshl_i32(i32 %a, i32 %b, i32 %c)
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%r = call i32 @llvm.fshl.i32(i32 %a, i32 %b, i32 %c)
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ret i32 %r
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}
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; @llvm.fshr is wrapped in a generated SPIR-V helper function.
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define i32 @fshr_i32(i32 %a, i32 %b, i32 %c) {
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; CHECK-LABEL: define i32 @fshr_i32(
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; CHECK: call i32 @spirv.llvm_fshr_i32(i32 %a, i32 %b, i32 %c)
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%r = call i32 @llvm.fshr.i32(i32 %a, i32 %b, i32 %c)
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ret i32 %r
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}
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; The bswap helper is materialized with the standard shift/mask/or unrolling.
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; CHECK-LABEL: define i32 @spirv.llvm_bswap_i32(i32 %0)
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; CHECK-DAG: shl i32 %0, 24
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; CHECK-DAG: shl i32 %0, 8
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; CHECK-DAG: lshr i32 %0, 8
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; CHECK-DAG: lshr i32 %0, 24
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; CHECK-DAG: and i32 {{.*}}, 16711680
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; CHECK-DAG: and i32 {{.*}}, 65280
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; CHECK: ret i32
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; The fshl helper is materialized once with the spir_func calling convention
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; and computes the rotate body in terms of urem/shl/sub/lshr/or.
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; CHECK-LABEL: define spir_func i32 @spirv.llvm_fshl_i32(i32 %0, i32 %1, i32 %2)
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; CHECK: %[[#MOD:]] = urem i32 %2, 32
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; CHECK: %[[#A:]] = shl i32 %0, %[[#MOD]]
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; CHECK: %[[#SUB:]] = sub i32 32, %[[#MOD]]
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; CHECK: %[[#B:]] = lshr i32 %1, %[[#SUB]]
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; CHECK: %[[#OR:]] = or i32 %[[#A]], %[[#B]]
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; CHECK: ret i32 %[[#OR]]
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; The fshr helper mirrors fshl but shifts the LSB operand right first.
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; CHECK-LABEL: define spir_func i32 @spirv.llvm_fshr_i32(i32 %0, i32 %1, i32 %2)
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; CHECK: %[[#MOD:]] = urem i32 %2, 32
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; CHECK: %[[#A:]] = lshr i32 %1, %[[#MOD]]
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; CHECK: %[[#SUB:]] = sub i32 32, %[[#MOD]]
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; CHECK: %[[#B:]] = shl i32 %0, %[[#SUB]]
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; CHECK: %[[#OR:]] = or i32 %[[#A]], %[[#B]]
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; CHECK: ret i32 %[[#OR]]
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declare i32 @llvm.bswap.i32(i32)
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declare i32 @llvm.fshl.i32(i32, i32, i32)
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declare i32 @llvm.fshr.i32(i32, i32, i32)
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